RDMA/irdma: Add support for DSCP

Add DSCP support for the Intel Ethernet 800 Series devices.  Setup VSI
DSCP info when PCI driver indicates DSCP mode during driver probe or as
notification event.

Link: https://lore.kernel.org/r/20220202191921.1638-4-shiraz.saleem@intel.com
Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: mustafakismail

drivers/infiniband/hw/irdma/cm.c

@@ -2209,8 +2209,12 @@ irdma_make_cm_node(struct irdma_cm_core *cm_core, struct irdma_device *iwdev,
 			ibdev_warn(&iwdev->ibdev,
 				   "application TOS[%d] and remote client TOS[%d] mismatch\n",
 				   listener->tos, cm_info->tos);
-		cm_node->tos = max(listener->tos, cm_info->tos);
-		cm_node->user_pri = rt_tos2priority(cm_node->tos);
+		if (iwdev->vsi.dscp_mode) {
+			cm_node->user_pri = listener->user_pri;
+		} else {
+			cm_node->tos = max(listener->tos, cm_info->tos);
+			cm_node->user_pri = rt_tos2priority(cm_node->tos);
+		}
 		ibdev_dbg(&iwdev->ibdev,
 			  "DCB: listener: TOS:[%d] UP:[%d]\n", cm_node->tos,
 			  cm_node->user_pri);
@@ -3835,7 +3839,11 @@ int irdma_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
 	cm_info.cm_id = cm_id;
 	cm_info.qh_qpid = iwdev->vsi.ilq->qp_id;
 	cm_info.tos = cm_id->tos;
-	cm_info.user_pri = rt_tos2priority(cm_id->tos);
+	if (iwdev->vsi.dscp_mode)
+		cm_info.user_pri =
+			iwqp->sc_qp.vsi->dscp_map[irdma_tos2dscp(cm_info.tos)];
+	else
+		cm_info.user_pri = rt_tos2priority(cm_id->tos);
 
 	if (iwqp->sc_qp.dev->ws_add(iwqp->sc_qp.vsi, cm_info.user_pri))
 		return -ENOMEM;
@@ -3977,7 +3985,11 @@ int irdma_create_listen(struct iw_cm_id *cm_id, int backlog)
 	cm_id->provider_data = cm_listen_node;
 
 	cm_listen_node->tos = cm_id->tos;
-	cm_listen_node->user_pri = rt_tos2priority(cm_id->tos);
+	if (iwdev->vsi.dscp_mode)
+		cm_listen_node->user_pri =
+			iwdev->vsi.dscp_map[irdma_tos2dscp(cm_id->tos)];
+	else
+		cm_listen_node->user_pri = rt_tos2priority(cm_id->tos);
 	cm_info.user_pri = cm_listen_node->user_pri;
 	if (!cm_listen_node->reused_node) {
 		if (wildcard) {

drivers/infiniband/hw/irdma/cm.h

@@ -384,6 +384,13 @@ int irdma_schedule_cm_timer(struct irdma_cm_node *cm_node,
 			    struct irdma_puda_buf *sqbuf,
 			    enum irdma_timer_type type, int send_retrans,
 			    int close_when_complete);
+
+static inline u8 irdma_tos2dscp(u8 tos)
+{
+#define IRDMA_DSCP_VAL GENMASK(7, 2)
+	return (u8)FIELD_GET(IRDMA_DSCP_VAL, tos);
+}
+
 int irdma_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param);
 int irdma_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len);
 int irdma_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param);

drivers/infiniband/hw/irdma/ctrl.c

@@ -77,6 +77,12 @@ static void irdma_set_qos_info(struct irdma_sc_vsi  *vsi,
 
 	vsi->qos_rel_bw = l2p->vsi_rel_bw;
 	vsi->qos_prio_type = l2p->vsi_prio_type;
+	vsi->dscp_mode = l2p->dscp_mode;
+	if (l2p->dscp_mode) {
+		memcpy(vsi->dscp_map, l2p->dscp_map, sizeof(vsi->dscp_map));
+		for (i = 0; i < IRDMA_MAX_USER_PRIORITY; i++)
+			l2p->up2tc[i] = i;
+	}
 	for (i = 0; i < IRDMA_MAX_USER_PRIORITY; i++) {
 		if (vsi->dev->hw_attrs.uk_attrs.hw_rev == IRDMA_GEN_1)
 			vsi->qos[i].qs_handle = l2p->qs_handle_list[i];

drivers/infiniband/hw/irdma/main.c

@@ -79,6 +79,10 @@ static void irdma_fill_qos_info(struct irdma_l2params *l2params,
 	}
 	for (i = 0; i < IIDC_MAX_USER_PRIORITY; i++)
 		l2params->up2tc[i] = qos_info->up2tc[i];
+	if (qos_info->pfc_mode == IIDC_DSCP_PFC_MODE) {
+		l2params->dscp_mode = true;
+		memcpy(l2params->dscp_map, qos_info->dscp_map, sizeof(l2params->dscp_map));
+	}
 }
 
 static void irdma_iidc_event_handler(struct ice_pf *pf, struct iidc_event *event)
@@ -110,7 +114,7 @@ static void irdma_iidc_event_handler(struct ice_pf *pf, struct iidc_event *event
 		ice_get_qos_params(pf, &qos_info);
 		irdma_fill_qos_info(&l2params, &qos_info);
 		if (iwdev->rf->protocol_used != IRDMA_IWARP_PROTOCOL_ONLY)
-			iwdev->dcb_vlan_mode = qos_info.num_tc > 1;
+			iwdev->dcb_vlan_mode = qos_info.num_tc > 1 && !l2params.dscp_mode;
 		irdma_change_l2params(&iwdev->vsi, &l2params);
 	} else if (*event->type & BIT(IIDC_EVENT_CRIT_ERR)) {
 		ibdev_warn(&iwdev->ibdev, "ICE OICR event notification: oicr = 0x%08x\n",
@@ -285,7 +289,7 @@ static int irdma_probe(struct auxiliary_device *aux_dev, const struct auxiliary_
 	ice_get_qos_params(pf, &qos_info);
 	irdma_fill_qos_info(&l2params, &qos_info);
 	if (iwdev->rf->protocol_used != IRDMA_IWARP_PROTOCOL_ONLY)
-		iwdev->dcb_vlan_mode = l2params.num_tc > 1;
+		iwdev->dcb_vlan_mode = l2params.num_tc > 1 && !l2params.dscp_mode;
 
 	if (irdma_rt_init_hw(iwdev, &l2params)) {
 		err = -EIO;

drivers/infiniband/hw/irdma/osdep.h

@@ -5,6 +5,7 @@
 
 #include <linux/pci.h>
 #include <linux/bitfield.h>
+#include <linux/net/intel/iidc.h>
 #include <crypto/hash.h>
 #include <rdma/ib_verbs.h>
 

drivers/infiniband/hw/irdma/type.h

@@ -611,6 +611,8 @@ struct irdma_sc_vsi {
 				struct irdma_ws_node *tc_node);
 	u8 qos_rel_bw;
 	u8 qos_prio_type;
+	u8 dscp_map[IIDC_MAX_DSCP_MAPPING];
+	bool dscp_mode:1;
 };
 
 struct irdma_sc_dev {
@@ -735,11 +737,13 @@ struct irdma_l2params {
 	u16 qs_handle_list[IRDMA_MAX_USER_PRIORITY];
 	u16 mtu;
 	u8 up2tc[IRDMA_MAX_USER_PRIORITY];
+	u8 dscp_map[IIDC_MAX_DSCP_MAPPING];
 	u8 num_tc;
 	u8 vsi_rel_bw;
 	u8 vsi_prio_type;
 	bool mtu_changed:1;
 	bool tc_changed:1;
+	bool dscp_mode:1;
 };
 
 struct irdma_vsi_init_info {